The Italian director Saverio Costanzo has signed on to direct and to help write a 32-part television series based on the four Neapolitan novels by the author who publishes under the pseudonym Elena Ferrante.

The novels, published between 2012 and 2014, have developed a cult international following. They are “My Brilliant Friend,” “The Story of a New Name,” “Those Who Leave and Those Who Stay” and “The Story of the Lost Child,” and trace the lives of two friends, Elena and Lila, from their childhoods in postwar Naples to the present.